Singlespeed & Fixed Gear"I still feel that variable gears are only for people over forty-five.
Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

a 1-2kg difference in the frame will not be very noticeable. A single 500ml waterbottle full of water weighs .5kg/1 pound.. i don't notice the difference when i ride with a full bottle vs an empty bottle

In my experience with my leader @ 18lbs putting on an extra 2lbs in the wheelset really made the bike feel like a slug. That being said, I think it all depends on where the weight is on the bike. I don't think you'd feel the extra half a pound in your seat+post vs a lighter weight set, but you would definitely notice a half a pound difference in your wheelset (rotational weight).

I will say that my Aluminum Leader @ 18lbs feels a lot quicker than my 18lbs Steel Kilo did, but I can't quite make a comparison between a bike I started with and a bike in which I knew what I wanted.

what alot of people kind of forget is that the weight you have to move is the bike plus the rider. It really comes down to how much easier is it to move 180lbs vs 185 lbs. Not much of a difference. That being said, I agree that it makes more of a difference where the weight is. Lighter wheels do make the bike "feel lighter".

I'm just ballparking in my head, but I think Kinlin rims with double butted spokes to a lightweight front road hub and a low flange rear track hub will get you at least 3/4 lb (1lb = approx. 450g) lighter than Mavic Ellipses, which have a claimed weight of 1895g. You could probably do this build for less than the cost of a new Ellipse set, too.

after checking out the price for carbon wheels and falling off my chair I think I'll stick with aluminium for now
really tho is that even justifiable (as in cost Vs benefit) to buy and use it on the streets?!

@yummy weight was one aspect of me wanting a ellipse wheelset, the hub quality, spokes...and at U$450 it isn't all that bad